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id="Observation.effective[x]"> <path value="Observation.effective[x]" /> <slicing> <discriminator> <type value="type" /> <path value="$this" /> </discriminator> <ordered value="false" /> <rules value="open" /> </slicing> <min value="1" /> <type> <code value="dateTime" /> </type> <type> <code value="Period" /> </type> </element> <element id="Observation.effectivePeriod"> <path value="Observation.effectivePeriod" /> <min value="0" /> <max value="1" /> <type> <code value="Period" /> </type> </element> <element id="Observation.effectivePeriod.start"> <path value="Observation.effectivePeriod.start" /> <min value="1" /> </element> <element id="Observation.performer"> <path value="Observation.performer" /> <min value="1" /> <type> <code value="Reference" /> <targetProfile value="http://hl7.org/fhir/StructureDefinition/Organization" /> </type> </element> <element id="Observation.performer.reference"> <path value="Observation.performer.reference" /> <min value="1" /> </element> <element 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